TIMED(8)TIMED(8)NAME
timed - time server daemon
SYNOPSIS
/usr/etc/timed [ -t ] [ -M ] [ -n network ] [ -i network ]
DESCRIPTION
Note: timed is obsolete; ntpd(8) is recommended.
Timed is the time server daemon and is normally invoked at boot time
from the rc(8) file. It synchronizes the host's time with the time of
other machines in a local area network running timed(8). These time
servers will slow down the clocks of some machines and speed up the
clocks of others to bring them to the average network time. The
average network time is computed from measurements of clock differences
using the ICMP timestamp request message.
The service provided by timed is based on a master-slave scheme. When
timed(8) is started on a machine, it asks the master for the network
time and sets the host's clock to that time. After that, it accepts
synchronization messages periodically sent by the master and calls
adjtime(2) to perform the needed corrections on the host's clock.
It also communicates with date(1) in order to set the date globally,
and with timedc(8), a timed control program. If the machine running
the master crashes, then the slaves will elect a new master from among
slaves running with the -M flag. A timed running without the -M flag
will remain a slave. The -t flag enables timed to trace the messages
it receives in the file /usr/adm/timed.log. Tracing can be turned on
or off by the program timedc(8). Timed normally checks for a master
time server on each network to which it is connected, except as
modified by the options described below. It will request
synchronization service from the first master server located. If
permitted by the -M flag, it will provide synchronization service on
any attached networks on which no current master server was detected.
Such a server propagates the time computed by the top-level master.
The -n flag, followed by the name of a network which the host is
connected to (see networks(5)), overrides the default choice of the
network addresses made by the program. Each time the -n flag appears,
that network name is added to a list of valid networks. All other
networks are ignored. The -i flag, followed by the name of a network
to which the host is connected (see networks(5)), overrides the default
choice of the network addresses made by the program. Each time the -i
flag appears, that network name is added to a list of networks to
ignore. All other networks are used by the time daemon. The -n and -i
flags are meaningless if used together.
FILES
/usr/adm/timed.log tracing file for timed
/usr/adm/timed.masterlog log file for master timed
SEE ALSOntpd(8), date(1), adjtime(2), gettimeofday(2), icmp(4P), timedc(8),
TSP: The Time Synchronization Protocol for UNIX 4.3BSD, R. Gusella and
S. Zatti
4.3 Berkeley Distribution May 28, 1986 TIMED(8)